Bending press



F. W; McARD'LE.

BENDING PRESS.

APPLICATION FILED OCT. 29, 1920. 1,424,366, Patented Aug. 1,1922.

3 SHEETS-SHEET l- F. W. McARDLE.

BENDING PRESS.

iii

FRED W. MGARDLE, 013 BOSTON, MASSAGHUSE-T'IE;

BENDING Passe.

insists.

Specification of Letters latent.

Patented rang; l, 1922.

Application filed October 29, 1920. Serial No. 420,520.

T (ZZZ will-0721 it an my concern Be it known that I, Flinn ll. MoAnnLn,a citizen of the United States, residing at Boston, in the county ofSuffolk and Eitate Oil Massachusetts, have invented certain new anduseful Improvements in Bending Press,- cs, of which the following is aspecification.

The object of my invention is to provide an improved machine for bendingstructural beams, bars, pipes and the like.

I am aware that the use of a segmental form with shoes coacting, isoldin the arts, and that the method of bending step by step, is also old. a

My invention consists in thenovel construction. and combination of wellknown elements, to accomplish. my object econo1nirally. This, togetherwithother features, will appear in the accompanying specifications andclaims, and the drawings forming a part thereof. The drawings illustratea preferred form oil this invention, but other constructions andmodifications may be used, without departing from the spirit and scopeof the invention. In these drawings Fig. 1 shows a side elevation of amachine embodying my invention;

Fig. 2 shows a clamp used in connection with the forming segments,

Fig. 3 shows a plan or the machine.

F el shows an end view illustrating the carriage, carrying the bendingmechanism.

Fig. 5 shows anend view oi? the holding clamp for a pipe, bar or beam.

Fig.- 6 shows a side elevation. of the same clamp.

Fl '7 shows an end elevation oil: the forming so .ment support.

Fig. 8 shows a plan of the bendingmechanism in extreme bending position.

In the drawings, a pedestal, 2lf22 are side rails secured thereto, 23 isa rail segment, concentricwith the post 26, which forms an integral partof the pedestal, 20.

Legs 2l25 :l orm supports to which the outer ends of the rails 2l-22,and the segment 23 are attached; theelemcnts described forming a frameor bed to support the other parts of the machine, and to resist thereactions when the machine is operated. The bars :ll)I-l1, are jou rnaled at one end, on the post 26, and near the other end are connected.bymeans oi the bolts 32 and nuts 33, the bushing Bl serving as a spacerfor the bars. Thisconstruction forms a swinging arm, rotatable on thepost 26, the bar bearing on the shoulder portion 36 of the post 26, andthe bar 31 resting on the top of the pedestal at35, the members of thearm thus being parallel throughout their length. The bar 31 is boredsuiiiciently larger than the diameter of the post 26,t0 permit the useof a bushing 37, which projects through the bar for the purpose ofsupporting the hub to of the forming segment 41. The brushing 37may beprovided with the flange 38, to give a larger supporting surface for thehub, and inthis case, snflicientclearance is allowed on the bottom ofthe flange to insure that the weight of the hub and segment shall notbear onthe arm member 31, and thus interfere with the I free rotation ofthe when the machine" is operated. The segment All, on which the pipe orstructural shape is bent, consists of an outer rim 4L2, shaped toconform with the section of the shape or pipe as shown at 4:3. v i iArms 4l4l-r5- 46 connect this rim 1-2 with the l1lll lO, which is cutaway at 47, to perniit the ready removal of the forming seg ment, andthe change to others of different radii or shape oit i ormmg groove. Asthese forming segments mustbe substantially rigid with the frame orbase, during the bending,

operation, means are provided to support and secure them rigidly in apredetermined relation to the pedestal and. the frame, and a preferredmethod is shown in Figs. 3, 6, 7. The forming segment 41, is'providcdwith a bracket 50 on the arm .45, which is formed with a downwardlyextending rib 51, which is adapted to bearonthe carriage This carriageis mounted on the rail 21, andis firovhled with rolls 5?, rotatable onthe bolts 5l.-which also serve/to secure the outside plate to the rnainpart of the carriage.

. Similar bolts 56 secure the plate below, thei bossesoi and the flange58serv1ng to separate the plate and the carriage proper, to providespace for the rail 21, on which the carriage rides. A boss 59, extendingupwardly from the flange is tapped to re- ;ceivethe set screw 60, whichis adapted to engage the inner side of the rib 51. I

This secures the formingsegment rigidly relative to the rail 21 and thecarriage 52 Projecting outwardly from the arm 46, is a boss (35, throughwhich extends theehole (56. i This boss engages One member 67, of

a clamping device which is adapted tohold securely the pipe or bar whichis to be bent. This member will hereafter-be referred to as the rearclamp bracket.

This bracketis formed with a recess 68,

into which the boss 65 extends, the upper wall :of the recess 69, andthe base 'of'the bracket, at 70, being provided with'holes adapted toalign with the hole 66 in the boss 65. A coupling pin 71, through theseholes, serves to secure the forming segment to the bracket 67, which inturn is supported by, and secured to a carriage 76.

, This carriage is similar in character to the carriage 52, so far asmountlng'andgeneral construction goes, but it is adaptedto support theclamping device in additlon to serving as support for the formingsegment.

i .Tt'is obvious that the forming segment secured as described isheldsubstantially rigid, and yet may readily be released and replaced.

The rear clamp bracket 67 may be secured to the carriage in a variety ofways, and I have shown;L satisfactory method, bolts 75 passingthroughears formed on the bracket and through the carriage, to be fastened inplace by nuts. This bracket is supplemented "by a'frontbracket 80,secured to the carriage in a similar way as the rear bracket, by

means of the bolts 81 and corresponding I nuts. This bracket is tappedto receive the 85, which serve to limit the movement of the clamp screw82, which is provided with a head, through which extends a hole in whichthe bar 83 isslidable.

is rigidly secured to both by bolts 91. This b'ar,"togetherwith a flange92, formed on the carriage 76, provide guides for a slidable clampblock9 8,against the back of which, the clamp screw 82 bears. N ear the endof 7 this screw, it is grooved as shown at 95, and the'projecting end94: engages the bottom of 10 1,, are formed with projections 105, whichswing out of the path of the filling blocks when they are slid intoplace, and which'engage the backs of these blocks when the blocks are atthe limit of their movement in the dovetailed recesses, the lugs 102 andthe projection 105 on the dog 103, cooperating to secure the fillerblock 100 against'movement lengthwise of the dovetailed recesses. Inoperating the machine, the block 93 togetherwith its filler block, isretractedby the screw 82, permitting the insertion of the pipe or barbetween the two filling blocks. The block 93 is then tightened onthepipe or bar which is-thus held rigidly enclosed by .the filling blocks100. hen secured in this 'way, the pipe or bar is in alignment with thegroove in the forming segment ehthe part of the pipe or bar extendinginwardly and athtpted to conform to the groove in the a counterboreformedin the block 93, a plate "96, forked to ht into the groove95,be1ng fastened to the block, in order that the screw will act both toapply pressure to the block direction. The contiguous sides of the block93 and the rear clamp bracket 67, are adapt- "edto receive and hold thereplaceable vfiller blocks 100, which may be secured in place in andtowithdraw it, when turned in the other segment as the operationprogresses. Since the forming segment'is secured, through the carriagesand 76 to the rails 21 and 22 and reacts on the post 26, it. is heldrigidly in position as the machine operates. It has been found thatwith'some sections to be bent, the

'- points of support for the forming segments are so disposed thattheyserve as fulcra, the preponderance in weight of the rim 41 tendingto rotate the forming segmentonthese' fulcra, and thus permit the formedgroove "to drop outo'f alignment with'the axis of the pipe or structuralshape.

As it is advisable to leave a space between the bars 30 and 31, greaterthan the length of the hub 40, in order that the segments maybe readilychanged, the tendency noted is controlled by means of an open collar110, which may be removed when the segments are changed, and whichserves to hold the hub 10 down, the setscrews 1'11 securing the collarto the post 26 after the former is in place. It is obvious that otherwell known methods may he used to accomplish this purpose although thisis a preferred form. l

In this form of the invention, the bending mechanism is mounted on acarriage which is slidable on the. swinging arm formed by the bars 30-31and spacers 342, and this will be presently described. As above noted,the swinging arm is rotatable about the post 20,

and the forming segment is concentric with the axis thereof, as isalsothe frame member 23. This member 23,serves-not only as apartof theframeof the machine,but also,

a variety of ways, but are here shownlas engaging dovetailed recesses101 formed in the block and in the bracket, These filhng blocks shapedto. conform with the pipe or structural section to be bent, are slidinto engagement with the slidable block and the rear clamp block,projecting lugs 102 serving to :limitthe inward movement, as they abutthe outer sides of the block and the bracket; Dogs 108, swiveled .on thescrews" on its top surface, as'a traclcon which the rollers 115*116 mayride. These rollers are secured respectively to the shafts 117 118iourna'ledin the truck 119, secured to the bar 31,'of the swing arm,near its outer end, and whichserves to support the weight of the outerend of the swinging arm and the weight of the mechanism carried thereby.Secured to the shaft 118, is a pinion 120, adapted to engage thesegmental rack 121,

secured to the frame member 23, concentric with the axis of the post 26.The shaft 118 is extended outwardly to clear the end of the swingingarm, and Secured tothe outer end of this shaft is the hub122, from whichproject the radial arms 123'. lly means of this construction, theswinging arm may be readily rotated ineither direction about the post26, to adjust the bending mechanism carried by the swinging arm to thera dial position required for a bending operation. In machines for heavyservice, a' similar construction maybe used to move the clamp carriage,but ordinarily it 'is'unnecessary as the rollers 77 riding on the rail22, permit the clamp carriage to be readily moved along the rail.

The bending mechanism is mounted on a carriage, slidable on the swingingarm, and this will hereafter be designated as the bending carriage. lnthisform of the invention, the bending carriage is constructed asfollows :A top plate 130, and a bottom plate 131, both with suitable.projections adapted to support the mechanism required, are 0011-.

nected by spacer studs 132-133181, the nuts 135-136 serving to securethe studs and plates together in a rigid construction. As here shown,the mechanism is operated by an electric motor 1%, the pinionl'38 beingrigidly secured to the motor shaft, and meshing with the gear 139, onone end of an intermediate shaft with a bearing in the stand 140,secured to the top plate 130. Secured to the other end of theintermediate shaft is the pinion 141'meshing with the gear 1 12, securedto one end of the worm shaft 14-3. 1

It is obvious that themotor and gearing may be replaced by a belt drivenworm shaft, the gear 142 being replaced bya pulley" from which abeltmayiead to a source of power. The worm shaft 14?), is journalled at1 14c145 and between these bearings, "theworin 14-6 is rigidly securedto the shaft 14:3, a'suitable thrust bearing 1%? serving to reduce theend friction due to the reaction of the worm n'ieshing with the wormgear 1&8. This worm gear is rigidly secured to one end of a shaft 149, aplate 150 secured by the bolt 151, tapped into the end of the shaft H9,providing added assurance against end movement,in case of loosened keys.The shaft 149 is journaled at 152- in the top plate and the bottomplate, and between these bearings, the cam 153 is keyed to the shaft 11-9, a pin 154, passing through the hub of the cam and the shaft,serving to prevent any upward. movement'of the shaft. It has been foundadvisable to use this form of construction on account of thepracticaldifiicnlty in assembling the cam when a long key is used,

but other ways i for rigidly securing the wormgear and the cam may beused. The key in the cam and shaft is therefore depended upon to insurerotation of the cam and the pin toprevent possible end movement of theshaft in the hub of the cam as the worm gearis rotated by the worm, theaction of which tends to lift the gear and shaft-rat tached, Thistendency causes a reaction between theztop of the cam hub and the upperbearing 152, and to reduce the friction,

the thrust bearing 155 is introduced between. The worm may be made lefthand instead of right, and the gear made to correspond, in which case.the reaction would be downward on the upper bearing 152, and in thatcase the thrust bearing155 would be introducedbetween the bottom of thegear hub and the top of the upper-bearing 152; the form illustrated anddescribed is, however the preferred form. As the cam is rotated by themeans described, the periphery 156 en-. gages a roller 157, journaledona shaft 158, whichsforms a hingepin connecting the links 159 and160,wl1ich constitute a toggle joint for the purposeof operating thebending shoe 161. Y These links, together with the shoe, are disposedin. the following mana ner:-The link 159 is rigidly secured to a shaft165, rotatably mounted in bearings 166 formed in both top andbottonrcarriage plates 130 and 131. The pin 158 connects the other endof thelink'159, and thelink 160, and serves as afhinge. The. other endof the link 160 is hinged to the shoe holder. 168 by the pin 16?,rigidly held in a boss 169 formed on one'end of a radius lever 170,journaled on the-spacer stud 18%. The hub of this radius lever isformedto extend be tween the carriageplat-es 130 and'131, and serve as aspacer, thus spacing the .platesat 132, 133 and 13st, and, forming arigid carrings on which the mechanism for bending, is mounted. Rigidlysecured to the top of the shaft 165, is the segment 180 adapted toengage another segment 181, journaled on a stud 182, projecting fromthetop plate 130. of the carriage. Preferably engagement of the twosegments is accomplished. by intermeshing teeth 183, but it is obviousthat the object may be attained by other commonly known mechanicalmeans. A stud 18%, projecting from the worm wheel 148, forms a journalfor the friction roller 185,;whie-h is adapted to engage an arm 186,which extends laterally fromthesegment 181. As the worm wheel 1&8 isrotated,together with the cam 156, the peripheryof the cam engages theroller 15?, and the toggle joint above ."described, is straightened,which in turn causes the bending shoe to engagethe pipe or bar to bebent about the forming segment all; as the rotation oftheworm gear andcam] continues ,zthe arm 186 is'engaged by the roller 18.5,"and thesegmentlSl is rotated on its bearing stud182. ilhroughthe intermeshingteeth, the segment lever 180 is rotated,- and "the shaft to which it isat-;

claim :5 i i tached ,thelink 159, rotating with the shaft, actsto'retract the shoe from its extreme bending position, and the swingingarm may be moved to a new position, preliminary toanother bending cycle.I do not confine myself: to. this method for retracting the shoe, butmay use other means for oscillatingthe link 159, for this purpose. As itis desirable to use forming segments o'f dififerent shapes in the.forming groove, and of difl'erent radii of bend,.it is necessary thatthe carriage supporting the bending mechanism,fbe' adjustable ontheswinging arm, relative to the post 26; As the position of thecarriageon-the swinging arm isprede termined for any forming segment byits radine and sectional shape to be bent, the carriage maybe anchoredradially for anysegment, by, means of an anchor stud 190 which passes"through aligned holes in the carriage plates 130-131 and plates 30- 31of the swinging arm, strengthening. bosses being formed on the carriageplates.-

-A series'ot holes correspondingto the forming segments used, areprovidedin the swinging arm plates as indicated at193;

-In operating the machine, the proper.

forming segment is slid into place the hub engaging the post 26, and thesupporting carriage and: the clamp carriage secured to the segment asdescribed.v Collar. 110 is then adjusted to bear on the top of the hub40. WVith the carriage on the swinging arm anchoredin the predeterminedposition for the segment used, andthe swinging arm in a radial positionnear the clamp carriage,

the motor is startechjandthrough the mechanism above-described, the pipeor baris bent, I

to an extent depending on the position of the swinging a'rm' radially.The continued rotation otthe operating mechanism retracts the shoe, andduring this interval in the cycle of bending, the swinging arm is movedto a new radial position relative to the post I 26, preparatory toanother bending opera tion. This proceeding is continued until theproper angle 0t. bend in the pipe or bar is obtained. 7

It is obvious, that while no connections to the motor are shown-wiringand switches may be ,used which are commonly used in slmilar cases,start1ng, st01 )p1ng and reversing ofthe motor all-being possible withapparatuscommercially obtainable. J Having thus described my invention,vI

.1. In a bending press, the combination of a rigid former; a shoeadapted to coact therewith; a lever swivelled at oneend to theshoe andat the'other rotatable on aiixed axis; a link, hinged at one end to theshoe, and'at its other end tokajlever rotatable about "a fixed axis; arotatable cam, adapted toengage the hinge connecting the lever and link,for the purpose of rotating the lever,

and thereby,1through the link, causing the shoe to coact with theformer; and means for rotating thecani, asand for the purpose described.7 i

2. In a bending press, tliecombiiiation of a rigid former; a shoe"adapted to coact therewith; a lever 'swivelled at one end to the shoeand at the other rotatable on a fixed axis; a link, hinged at one end"to the shoe, and at itsother end to a lever rotatable abouta fixed axis;a rotatahle'cam, adaptedto' engage a frictionroller ournaledon the hingepin connecting the lever and the-hnk, for the purpose of rotating thelever, and i i 'j Y thereby, through t e link, causing thesnoe toflcoactwith the former; and means t'or rotating the cam, as and for the purposedescribed. p. j v V v 3. In a bending press the combination of 'arigidformer; a carriage relativelyadjust able therewith; alever swivelledatone end to the shoe-and at the other'rotatable on an axis fixedrelativeto' the carriage; ashoe adapted to coact *withthe former; alink, hinged at one endto the shoe, and at its other end' to a lever,rotatable onan axis,

fixed relativetothe carriage; a cam rotatably mounted on the carriageand adapted to engagea friction roller yournaled on therhingepinconnecting the lever and the link,

for the purpose of rotating the lever and thereby, through the link,causing the shoe;

to coact with the former; and means for rotating the earn, as and forthe purpose described. i a a 4;. In a bending press, the combination ofa ri id former; a-carriage relatively adjust able therewith; a shoe,mounted on the carriage; means for controlling the movement of the shoeina predetermined path in the directionof the former, for thepu'rpose ofcoacting therewith; a' link, hinged at one end to the shoe, and at itsother end to a lever, rotatable on team, fixed relative to the carriage;a cam rotatably mounted on the carriage and adapted to engage afric tionroller journaled on the hinge pin connecting the lever and. the link,for the purpose of rotating the lever, and thereby, through the linlecansing the shoe to coact with the former; and means for rotating thecam, as and for the purpose described.

5. 111 a-bending press, the combination arigid former a carriagerelatively adjustabletherewith; a shoe adapted to coast with with theformer; and means for rotating the cam, as and for the purposedescribed;

6. it bending press, comprising a base; a post rigid. therewith;interehangeable forming segn'ients rigidly supportedon the base, andsubstantially concentric with theuaxis oil? the post; an arm adapted toswing abmrt the axis of the post; acarriage mounted on the arm and.adapted to be secured thereto in different positions longitudinal ot'thearm;

a. shoc adapted to coact with the forming segment, and swiveled atoneendto a lever rotatal'ile at its other end on an axis fixed relative tothe carriage; a. link, hinged at one end to the shoe. and at its otherend to a lver, rotatable on an axis, fixed relative to the carriage; acam rotatably mounted on the carriage and adapted to engage a trictionroller journaled on the, hinge pin connecting the lever and the link,for the purpose of rotating the lever, and thereby, through the link,causing the shoe to coact with the former; and. means for rotating thecam, as and for the purpose described.

7. In a hendingpress the combination of a rigid former; acarriagerelatively adjustahle therewith; a shoe holder; interchangeableshoes adapted to be secured thereto; a lever swiveled to the shoeholder, and rotatably mounted on the carriage; a,

link, hinged at one end to the shoe holder, and at its other end to alever, rotatably mounted on the carriage; a cam rotatably mounted on thecarriage and adapted to engage a friction roller journaled'pnthe hingepinconnecting' the lever and the link, for the purpose of rotating thelever, and thereby, through the link, causing'the shoe to (-oact withtheformer; and means for rotating the cam, as and for the purposedescribed.

8. A. bending press comprising a base; a post rigid therewith;interchangeable forming segments rigidly supported on the base, andsubstantially concentric with the axis of the post; a clamping device,supported by the base, and radii'illy adjustable relative to the post,torthe purpose of holding the pipe or bar to be bent in fixed relationto the forming segment; an arm :ulapted to swing about the axis of thepost; a carriage mounted on the arm and adapted. to be -;e cured theretoin ditlerent positions longitudinal of the arm; a shoe adapted to courtwith the 'iorn'iing segment, and swiveled to lever rotatablv mounted onthe carriage; a link, hinged at one end to the shoe, and at its otherend to a lever, rotatable on an axis, fixed relative to the carriage; acam rotatably mounted on the carriage, and adapted to engage a frictionroll r journaled on the hinge pin connecting the lever and the, link,for the purpose of rotating the lever, and thereby, through the link,causing the shoe to enact with the forming segment; and means forrotating the cam, as and forfthe purposedes died.

9. A bending press comprising a base; ,ZL postrigid therewith; aclamping device supported by the base and radialiy adjustable relativeto the, post; interchangeabletormi n g segments, substanti allyconcentric, with the axis of the post; means torsecuringthe clampingdevice to the forming segmen't for the purpose of holding the pipe orbarto be bent in. fixed relation to the" forming segment; an arm adapted'toswingabout the axis of the post; a carriage mounted on the arm andadapted to be Secured thereto in diil'crent positions longitudinalof thearm;

a shoe ad aptedto 'coact with the formin tive to theearriage; a camrota-tably moimted on the carriage,.andadapted to engage a frictionroller journalled on the hinge pin connecting the leverand thelink,*fo'r the purpose of rotating the lever, and thereby, through thelink, causingv the shoe to coact with the forming segment; *and meansfor riage, adapted to coact with a block mor ably supported onthlecarriage, for the mpose of secure v holding thepipe' or bar to be bent;ii tercl'iangeable torming seg} ments, substantially concentric with theaxis rotating the ca1n, as and torthe purposede of the post;means forsecuring theclarnpingdevice to the torniingsegment in a fixedrelatioirthereto; means for rigidlydiolding the pipe or bar between-theextension; and the movable block of the clainpingdevice; an arm adaptedto swing about theaxis of the post; a carriage mounted on the arm andadapted to be secured thereto in different positions longitudinal of thearm a shoe adapted to coact withthe forming segment, and swiveled to alever, rotatably mounted on the carriage; a link, hingedat one end tothe shoe, and at its other end to a lever, rotatably mounted on thecarriage; a cam rotatably mounted on the carriage, and adapted to engagea friction roller journaled ou the hinge pin connecting the lever andthe link, for the purpose of rotating the lever, and thereby, throughthe link, causing the shoe to coact with the forming segment; and meansfor rotating the eam, as and for the purpose described.

11. A bending press comprising a base; a post rigid therewith; aclampingdevice com prising a carriage, radially adjustable rela- .it;supportsedjustably: secured to the base;

,tive to the post; an extension from the car riage, adaptedto coact Witha blockmovably supported on the-carriage, both the-extension ,fromfthecarriage, and theblock 7 being adapted to engage interchangeable shoesformed to hold the'pipe or bar to be bent;

' interchangeable,forniing segments, substantiallyieoncentric. with theaxis of the post;

means-for 'securing the clamping device to thedonning segment, in fixedrelation thereto;; means,forkrigidly holding the pipe or bar between theshoes engaged hy-the extelislonf fronrtlie carriage and theblook, of athe 'clampingdejvice; an arm adapted to swing about the aXis' or thepost; a carriage 'mo untedon the arm and adapted to besecured thereto indifferent posrtions long1tudinal of the ermyaushoe adapted to, coaotWith/the formingsegment, and swiveled to a lever, rotatably mounted onthe carriage;

a link, hinged at one end. to the shoe, and

i at the other end to a lever, rotatably mount,-

ed on the carriage; a cam rotatably mounted on the carriage, and adaptedto engage a friction roller journaled on the hinge pin connecting-thelever and the linkffor the purpose of rotatingthelever,and thereby,through the link, causing the shoe to coact Withuthefforming segment;and'means for. rotating the cam, as and for the purpose described) i 12.Avbending press comprising a base; a

post rigid therewith; interchangeable. formingsegments substantiallyconcentric With the axis-of the post,,and edeptedto engage means forsecuringlthe forming segments to the support and to the post, for thepurpose of holding thesegments in a fixed position; Jan arm adapted toswingaabout the axisqof thepost; a carriage mounted on the arm andadapted 1 to be secured thereto in different positions longitudinal. ofthe, arm;

a. shoe edapted to coact With the forming segment, end swiveled to alever, rotatably mounted on the carriage; a link,hinged at one end tothe shoe, and at the other end toa lever, rotatably mounted on thecarriage; a cam rotatably mounted on the car- .riege, andadapted toengage a friction roller journaled on the hinge pin connectingithe leverand the link, for the purpose of rotating the lever, and thereby,through the link,

causingnthe shoe to coact with the forming segmentyand means forrotating the'cam, as and torthe purpose described. e

13. In a bending press, the combination of e'rigid formena shoe adaptedtocoac-t therewith; a lever swivelled at one end to the shoe and at' theother end rotatable on a fiXed aXis;-a jlink, hinged at one end totheshoe, and at its other end to e leverrotatable about a fixed axis;arotateble cam,

adapted to engage a frictionroller journaled on the hinge pin connectingthe lever and lever, andthereby, through the link, cansing the shoe tocoaot Withtheiormer; means for retracting the shoe from the former; andmeansfm rotating the cam, as and'for the purpose described.

14:. In a bending press thecombinetion of i andmeans for rotating thecam, as andfor V the purpose described. a

I FRED W. MGARDLE.

the link,- for the purpose of rotating the

